Check the batteries..charge them and use it..may the battery must be worn out so replace the batteries...or only keypad lights are on and display is off then replace the display..an new display would b around 300 INR.

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Related Questions:

The default security code for a Nokia 3310 is "12345". If you have
changed it and forgot it, You can do a master reset to your mobile
phone. This could restore your phone with default factory settings. You
can get the master reset code for your Nokia 3310 from www.unlock-free.com for free. Good luck mate.

If you only wanted to Know procedure, this is exactly how you need to go about it :-

To upgrade 3310 to 3315 you need to reflash your phone to new version.
Seems to be first version used both in 3310 and 3315 (Asian version of
3310). After 5.45 firmware for both is the same. From this also changed
PPM packs (for example, Polish is now saved in "N", not in "J").

First of all you must remove SimCard from phone and charge battery.

Below you will find full step by step solution:

1. By using Universal Box v3.0 make a backup of flash from your phone
with range 200000 - 400000 (it will be safe backup if somethign will
goes wrong). If you don't have Universal Box v3.0 you can use
standalone Dejan Flasher and Mbus cable.

3. After flashign operation ended run software KNOK that can be
downlaoded from our page "Free Download-> Nokia". Connect phone to
function RJ in Universal Box or if you don't have Box use Mbus cable.
In Mbus function choose - Phone Settings -> Quick set FAID

4. Then choose Phone Settings -> Set new imei - and enter IMEI of phone. You can read it on back of phone.

it can be a software trouble. have to use flasher box to flash the mobile. if 1st boot is ok you can go through the flash process. most of problems in 3310 can fix if not damage to the UEM chip. 1st of all try to boost your mobile battery using extra power.